Dang can ban you, or me, or anyone. Doesn't make HN a bad forum. On the contrary, HN's moderation quality is widely praised and appreciated. Now imagine if it was free for all anarcho-libertarian forum. Or as another example a mastodon, where decentralization is touted as a huge benefit, but in practice it is a collection of extremely strict centralized islands, where a ban can lead to one's identity account forever lost, but unlike on HN, there is no public accountability to the instance mods there.